Multiple static WAN IP's

[Makaza]

I have an Asus RT AC68u router and a block of 8 static IP's (5 usable).

I can see how to set static private IP's for the various devices connected to my router but I can't find information on how to assign static public IP's to the devices . Can anyone one point me towards a guide or offer any assistance - please?

 

[viewtyjoe]

The purpose of the router is to hide the devices from the outside and offer a single public IP while using NAT to route requests correctly back to the devices on your network. What you are probably looking to do is set up port forwarding so that your devices can be accessed from outside the network.

 

[Makaza]

Viewtyjoe,
Thanks for your response - you may very well be right! I will have a look at port forwarding to see if it meets my requirements. However, given what you say can you explain what the 5 separate static public IP's would be used for?

 

[bill001g]

Like almost all consumer devices your router is not a "router" it is a gateway. It can only have a single wan ip address it nats everything to and it can only have a single lan subnet.

You might get it to work using a DD-WRT firmware images but it depends how the ISP has done what they are doing.

5 IP is a strange number which implies the are not doing the standard route a /29 subnet to your router. Some like say ATT uverse requires you to use their special modem/router to get this to work.

The way it would work if you really had a /29...which means you can use at least 6 if not all 8 ip.... is they let your wan port get a DHCP ip like any other consumer router. They then route the /29 to your device. You would then either put these addresses directly on the lan port or NAT them one to one with other addresses. They are many possibilties when they actually route you the block.

You are going to have to ask the ISP how you set this up unfortunately it is likely a propriety thing

 

[Makaza]

bill001g
Thanks for the comments. I believe I do have a standard 8 block of IP's. I believe of the 8 one is used for the router, one for subnet broadcast address and one is reserved (i don't know what for!).

When you say "NAT them one to one with other addresses" does this mean assign static public IP to each of the internal privat IP's? If you can point to any info on this it would be appreciated
Thanks for taking the trouble to respond

 

[abailey]

Do you need more than one IP? If not I would choose one IP and go from there. Is this for a business or home use?

 

[bill001g]

It really depends a lot on how they set this up. The could do it like att which appears they actually route it but there is some strange restriction because you really can only use 5 ip but you actually have a 6th one in assigned in a different subnet on the wan port. Another way to do this would be to for example use a system similar to a cable modem and directly let 5 of your devices obtain ip from their router on the subnet.

It really is impossible to tell for sure.

If they were doing this the standard way they route say 123.123.123.24/29 to your router. Your router could then put 123.123.123.25 on it lan port and hand out 123.123.123.26-30 to the end machine directly on the lan. The other way to do this is to say put 10.10.10.0/24 on the lan. You could then map 123.123.123.24-10.10.10.50, 123.123.123.25-10.10.10.55 .... 123.1231.23.31-10.10.10.xx Doing 1-1 nat you can actually use all 8 addresses.

Both these configuration are trivial on a commercial cisco router and there are tons of examples.

It is impossible to even guess what the ISP is up to since what they are doing has to be non standard. a /29 always has 6 usable addresses minimum and if you nat it or subnet it down to /32 you can use all 8.